Record in a quiet place with the microphone at a steady distance. Say names, acronyms, and numbers clearly; pause briefly when switching topics. A short recording with distinct sentences is easier to correct than a long stream of self-interruptions.
Before using Speech to Text, listen to the file and trim unrelated silence if needed. Keep the original audio and verify the transcript against it, especially for names, dates, negations, and amounts. Get consent where the recording includes others.
What kind of terms are being misheard?